I hate to be a pain, but please provide proof.
They do not fit the definition of pandemic spread, as they are mostly within families.
Each person could have been infected in the same way the first was.
Furthermore, there is no evidence that the index patient in each case has spread to patient #2, and then that patient #2 has infected someone else. So far, it stops at patient #2.
Scientific proof that patient #2 was infected by patient #1 is needed.
Needed by whom? As I said above, if you do not accept the assessment of the CDC which I have looked up and posted for you, then nothing will be the "proof" you want.
If you want any more information, then go get it yourself.
The only unknown is if it will mutate as a vigorous and high fatality strain as it is in its current form or become more benign. (We can only hope it weakens)
So, instead of asking for the evidence of proof that the particular strain has mutated, shouldn't we assume that such will happen, if not this year in the next five to fifteen years?
In that matter, this is a little like the parish SW of NO that decided to build its own Cat 5 levees. They look very smart to have done such preparation, but others said there was rarely a Cat 5 that acutally hit.